was posted on stackoverflow.com at 11h47'44Z today.
was posted on facebook.stackoverflow.com at 11h50'56Z, today also.
The asker is the same user, and the text is virtually identical.
Trying to close this second one as a duplicate of the first returns:
The duplicate question must exist on Facebook - Stack Overflow
(Same thing happens while trying to close the other way around, minus the Facebook.)
Is this interesting little double-posting "feature" intentional? Should such duplicates be flagged for moderator attention or is there something else that can be done in such cases?